Crash OSError: [WinError 87] The parameter is incorrect

[NiQ1]

Pretty much what the title says:

C:\Users\User\source\open\convert-outlook-msg-file>python outlookmsgfile.py < test1.msg > test1.eml
Traceback (most recent call last):
  File "C:\Users\User\source\open\convert-outlook-msg-file\outlookmsgfile.py", line 947, in <module>
    print(load(sys.stdin), file=sys.stdout)
  File "C:\Users\User\source\open\convert-outlook-msg-file\outlookmsgfile.py", line 41, in load
    with compoundfiles.CompoundFileReader(filename_or_stream) as doc:
  File "C:\Program Files\Python310\lib\site-packages\compoundfiles\reader.py", line 198, in __init__
    self._mmap = mmap.mmap(fd, 0, access=mmap.ACCESS_READ)
OSError: [WinError 87] The parameter is incorrect

C:\Users\User\source\open\convert-outlook-msg-file>